Electro-magnetically enhanced current interrupter

• US 7,023,307 B2
• Filed: 11/06/2003
• Issued: 04/04/2006
• Est. Priority Date: 11/06/2003
• Status: Active Grant

• Current Assignee: Pratt & Whitney Canada Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Pratt & Whitney Canada Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Dooley, Kevin Allan
• Primary Examiner(s): DONOVAN, LINCOLN D
• Application Number:
  US10/701,525
• Publication Number:
  US 20050099250A1
• Time in Patent Office: 880 Days
• Field of Search: 337/142, 337/220, 337163-166, 337/227, 337401-407, 335/147, 335/47, 335/58, 361/115, 361/124, 361/126
• US Class Current: 335/147
• CPC Class Codes: H01H 2085/386 with magnetic or electrodynamic arc-blowing
• CPC Class Codes: H01H 85/06 characterised by the fusible material H01H85/11 takes precedence
• CPC Class Codes: H01H 85/38 Means for extinguishing or suppressing arc by powder filling H01H85/18; by mechanical tension applied to fusible member H01H85/36

Abstract

The present invention provides an apparatus and method of interrupting the current in a circuit wherein the magnetic pressure induced by current flow through a conductor causes the conductor to flow and thereby open the associated circuit. Magnetic pressure may be derived from Lorenz equations. Gravity is not relied upon to cause the conductor material to flow. The invention may be used in circuits having high currents relative to conductor size and material selection.

Claims

1. A current interrupter for an electrical circuit, the interrupter adapted to open when a threshold current passes therethrough, the interrupter comprising a flowable conductor adapted for connection to the circuit, the conductor having a cross-sectional area, wherein the conductor cross-sectional area is sized relative to the threshold current such that a sufficient magnetic pressure is generated in the conductor to thereby force the conductor to flow, said flow being sufficient to thereby open the circuit.

2. The current interrupter of claim 1 wherein the conductor is solid during a normal operating temperature of the electrical circuit and flowable at a temperature above said normal operating temperature.

3. The current interrupter of claim 1 wherein said flow flows substantially independent of any gravity effect on the flow.

4. The current interrupter of claim 1 wherein the conductor is a eutectic material.

5. The current interrupter of claim 1 wherein the current interrupter additionally comprises at least one reservoir for receiving said flow.

6. The current interrupter of claim 5 wherein the reservoir is configured such that the conductor cannot fully flow into the reservoir under the action of gravity alone.

7. The current interrupter of claim 5 wherein the conductor has a core and an axial direction, and wherein the reservoir communicates directly with the conductor core and is adapted to permit conductor material to flow axially from a core region into the reservoir.

8. A current interrupter for an electrical circuit, the interrupter adapted to open when a threshold current passes therethrough, the interrupter comprising:

pressure means for forcing a flowable conductor connected to the circuit to flow sufficiently to thereby open the circuit, said pressure means comprising a conductor and a threshold current, the conductor sized and composed of a material such that the threshold current passing through the conductor generates a temperature and a forcing pressure sufficient to force said flow, said forcing pressure having a greater motive effect on said flow than a gravitational effect on said flow.

9. The current interrupter of claim 8 wherein the current interrupter has said pressure means fir opening the circuit and is free from any other means of opening the circuit.